Author: Scott Gasch
Date: 12:43:44 02/22/05
Go up one level in this thread
On February 22, 2005 at 09:20:31, Steffen Jakob wrote:
>On February 22, 2005 at 08:35:07, Andrew Wagner wrote:
>
>>Hi all.
>>I got sidetracked this morning by an interesting chess programming problem. It
>>took me a couple hours, but I think I have a working algorithm -- haven't tested
>>yet though. Anyway, I got to wondering if others would approach it the same way.
>>So I thought I'd make a little competition of it. Post your code here, and I'll
>>pick the program I like best and shower praise and adulation on its author. If
>>people like this challenge, maybe I'll do one each month or something. Anyway,
>>here's the one I did this morning:
>>There are 64 x 63 = 4032 ways to put a black knight and white knoght both on a
>>chess board. Write a program -- from scratch -- to generate FENs for each of
>>these positions. The FENs should look something like: Nn6/8/8/8/8/8/8/8 w - - 0
>>1.
>>
>>I think my code will wind up weighing in at around 60-70 lines of C. Can you do
>>better?
>
>Here is a quick hack. Without comments, with place to optimize, also almost
>untested, but shorter than yours ;-)
>
>
>#include <iostream>
>
>int GetFile(int square) { return square & 7; }
>int GetRank(int square) { return square >> 3; }
>
>int main(int argc, char** argv) {
> for(int white_knight = 0; white_knight < 64; ++white_knight) {
> for(int black_knight = 0; black_knight < 64; ++black_knight) {
> if(white_knight == black_knight) {
> continue;
> }
>
> for(int rank = 7; rank >= 0; --rank) {
> int n_empty = 0;
> for(int file = 0; file <= 7; ++file) {
> if(rank == GetRank(white_knight) && file == GetFile(white_knight)) {
> if(n_empty > 0) {
> std::cout << n_empty;
> }
> std::cout << "N";
> n_empty = 0;
> }
> else if(rank == GetRank(black_knight) && file == GetFile(black_knight)) {
> if(n_empty > 0) {
> std::cout << n_empty;
> }
> std::cout << "n";
> n_empty = 0;
> }
> else {
> ++n_empty;
> }
> }
> if(n_empty > 0) {
> std::cout << n_empty;
> }
> if(rank != 0) {
> std::cout << "/";
> }
> }
> std::cout << " w - - 0 1" << std::endl;
> }
> }
>
> return 0;
>}
[ scott@wannabe:~/tmp ] % g++34 -O -S steffen.cpp ; wc -l steffen.s
557 steffen.s
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